Results 31 to 40 of about 438,158 (154)
Dianci bileiqi, 2007 架空输电线路的雷击感应电压计算是电力线路绝缘设计、采取防雷保护措施的基础计算。对雷击750kV同塔双回输电线路塔顶产生感应电压的暂态过程进行了分析,采用电磁场数值分析方法,建立了回击电流模型和线路耦合模型,精确地计算了感应电压值。计算结果表明,感应电压随时间变化非常快,所以在计算雷击塔顶的耐雷水平时,如果把感应电压以一个恒定值的方式计入,必然会产生一定的误差,应该考虑感应电压的暂态过程。
高媛, 郭洁, 雷娟, 郭志涛
doaj
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Moisture‐enabled electricity generation technology offers a new paradigm for sustainable energy harvesting, but its practical applications are still limited by issues such as low output power and insufficient long‐term stability. In this paper, an asymmetric sandwich‐structured hydrogel moist–electric generator (SSHMEG) with an ion ...
Peng Chen +7 more
wiley +1 more source
, 2021 本发明公开一种高频感应等离子体风洞电子密度及电子温度诊断系统。所述MW级高频感应风洞产生等离子体来流，信号调制及功放单元根据风洞工作状态输出相应频率的扫描电压给探针单元收集带电粒子的电压源，通过独特的三电极探针结合噪声抑制电路将等离子体中的高频噪声及工信干扰噪声消除，所述电流采集单元采集到去噪后的电流信号经过隔离器H1与地线隔离，同扫描电压信号同时被数据处理单元记录并处理得到电子温度和电子密度。本发明消除了MW极高频感应风洞流场中强烈的电磁干扰，同时提出利用可高频扫描的优点 ...
张仕忠 +4 more
core +1 more source
Dianci bileiqi, 2018 雷电感应过电压是架空线路安全运行面临的主要威胁之一,需要对比分析采用避雷线和避雷器对线路感应过电压的防护效果。利用EMTP软件建立线路模型,编程计算雷电感应过电压,分析安装避雷线或避雷器对感应过电压的防护效果,讨论雷击点距线路距离、避雷线高度、避雷器安装间距、接地电阻等因素对感应过电压抑制效果的影响。分析结果表明:线路安装避雷线或避雷器后,感应过电压得到了不同程度的抑制,避雷器抑制过电压效果更为明显;雷击点距线路越远,避雷线的抑制效果有所增强,避雷器抑制效果减弱越明显;避雷线高度越高 ...
周玉娟, 李凯
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT In conventional piezoceramics, the coordinated change between the dielectric constant (εr) and the piezoelectric charge constant (d33) usually limits the piezoelectric voltage constant g33 (g33 = d33/εr), a critical figure of merit for piezoelectric sensors.
Xiaoying Feng +7 more
wiley +1 more source
Dianci bileiqi, 2016 针对检测电涌保护器（SPD）击穿方法的问题,通过对雷电过电压作用下,SPD击穿时周围产生的瞬态电磁场以及电磁感应的理论分析。利用组合波发生器（12、50μs）模拟雷电流发生器,对开关型SPD、限压型SPD分别做冲击试验。试验结果得出:冲击电压为0-5 k V范围时,传感器两端的感应电压随着冲击电压的增大而线性增加;冲击电压相同时,测试开关式压敏电阻的感应电压小于限压型压敏电阻;测试器件相同的情况下,不同表面尺寸的传感器两端的感应电压存在较大差异。探究了利用电磁感应的原理检测SPD的击穿方法 ...
李祥超 +4 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
wiley +1 more source
Dianci bileiqi, 2018 雷电感应过电压导致的10 k V配电线路跳闸事故十分频繁,需要合理计算线路雷电感应跳闸率并采取针对性防护措施。利用EMTP中的MODEL模块编程计算线路雷电感应过电压,建立线路模型考虑线路闪络跳闸情况,利用区间统计法求取配电线路雷电感应跳闸率,分析线路工频电压对感应跳闸率的影响,最后讨论安装避雷器的防护效果。分析结果表明:配电线路三相感应过电压波形较为类似,过电压幅值相差不大;雷击点距离线路越近,感应过电压可能引发的线路跳闸次数越多;线路工作电压对雷电感应跳闸率的影响很小,基本可以忽略 ...
桂前进 +6 more
doaj
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Moist‐electric generators (MEGs) harness energy from ubiquitous ambient humidity, which has emerged as a promising way to collect energy irrespective of location and time. This study presents a high‐performance MEG employing a bilayer Janus nanofiber membrane: a hydrophilic layer (lithium chloride/citric acid/polyvinyl alcohol) for enhanced ...
Peng Chen +7 more
wiley +1 more source